Pressure-reducing valve



May 29, 1923. I 457,049

E. WEBB v PRES SURE REDUC 1 MG VALVE Filed March 16, 1922 Patented May29, 1923.

EDWARD WEBB, or READING, MASSACHUSETTS, nssrenon or onunnnr To JULIANDESTE COMPANY, or cnannnsrown, MASSACHUSETTS, A 'conroan'rron or MAI E;

PRESSURE- REDUCING VALVE. I

Application filed March'16, 1922. Serial No. 544,100.

T 0 all whom it may concern:

Be it known that I, EDWARD WEBB, a Citiz- Zen of the United States,residing at Reading, in thecounty of Middlesex and State ofMassachusetts, have invented new anduseful Improvements inPressure-Reducing Valves, of whichthe following is a specification. W1 1This inventionrelatesto a pressure-reducing valve, the bodyof which hasan angular] bridge containing a circularopening connecting-the inlet andoutlet'portions of the body, a valve seat connected with thebridge, avalve body or disc cooperating with the seat to normally close thebridge opening at the inlet side, and adjustable means at the outletsideof the bridge, for causing the fluid pressure at the inletside toopen the valve sufliciently to permit-the passage of fluid the'rethroughat any predetermined reduction of pressure. i v

The valve seatand the valve disc jected to more orless rapid wear,particularly when thevalve. conducts steam, sothati these parts requirerenewal, and are neces--,

sarily separable from the valve -body.

One object of the invention is to provide simple, relativelyinexpensive, and conveniently operable means for detachably' connectingthe valve seatwith the valve body.

Another. object is to so improve the form of the seat, the connectingmeans, andthe valve disc, as to permit the. accurate'guiding ofthevalve'disc, and ensure unobstructed movements thereof.

Anotherobject is to provide means for preventing obstruction of themovement of the valve disc and pressure actuated parts" which movetherewith, in case of any slight distortion or warping of the valve bodyby severe strains on the latter.

Another object isto -minimize the noise and the wire-drawing action oflive steam on a the surfaces of the valve seat'and of the valve disc,which closes on the seat.

To these and other related ends the; invention consists in'theimprovements which I willnow proceed to describe and claim.

Of the accompanying drawings forming a. part of this specification,- cFigure 1 is'a vertical section of a valve embodying the invention.

Figure 2 is a perspective view of the cage which guides the valve disc,includes 3 1 Valve seat.

are sub- 7 rings of the cage'slidin 1- Figure 3 is a" perspective viewof the valve (.ISC. Figures 4 and 5areffragmentary sectional. views,each showing a portion of the cage and aportion of the valve disc, thelatterbeing shown closed in Figure 4C, and open in Figure 5. I I E Thesame referencecharacters indicate the same partsv in all of the figures.I The valve body 12has the usual inlet 13, outlet 14, and angular bridge1 5,the bridge being between the inlet and the" outlet, and providedwith a circular opening 16, In the portion of the-body 12 at the inletside of the bridge, is a circular opening 17, which is coaxial with,andot larger diameter than,

the bridge opening 16, and is spacedfrom 17, an inner ring 22, providedwithashouland rigid spaced apart bars 24, connecting der'23, seated onthe inlet side otthebridge,

said rings. V v The outerring is provided w1than=eX,-'

, ternal annular facefl25, having a sliding fit :inth e bridge opening16, andan internal annular guiding iace26, forming a guide, for thevalve disc. The seat 27 is, formed on the outer ring, at one end of theguiding face 26. 28 represents the valvedisc, which is provided with anannular. face. 29,- formedtact with the-internal guiding face: 26.

to close upon the seat 27, and with a stem V '30, having radial wings31, in sliding con- .The valve disc is normally-held-closed v I a spring32, seated on the cap 18. .WhenQthe, cap 18' is removed, the cage isremovablev from the valve body, the inner and outer body openings 16 and17. r

When the parts are being assembled, a

packing gasket 33 is applied to the shoulder and the bridge, and.thev'c'age is guidedto. place by the walls of the openings 16 and 17.The cap con t a tment for the I ,in the. bridge and 23, to form a-tight.joint between the cage spring, and a clamp which releasably confines thecage shoulder 23 against the bridge. The internal guiding face 26 of theinner cage ring constitutes a guide for the valve disc, ensuring freemovements of the latter, the said face and the stem wings 31 being soelongated that tipping and binding of the 1 valve disc is prevented.

To minimize the noise and the wiredrawing action of steam passingbetween the valve seat and'the disc face 29, I provide said disc with anoutwardly projecting annu'lar riser 3 L, spaced from the face 29, asbest shown by Figures 4 and 5. I also provide the cage ring 22 with aninwardly projecting annular riser 22 Vvhen the valve disc is open, steampasses through without objectionable noise, and its wearing orwire-drawing force is so distributed that it does not rapidly wear theseat 27 and the face 29.

A well -known form of adjustable pres-- sure-controlled means foropening the valve disc to maintain the desired reduced pressure at theoutlet side, is shown by Figure 1, and includes a cylinder 35, securedto the valve body at the outlet side, and provided with a head having aguide 36, a

piston 37, movable in the cylinder in the direction of the arrow, bypressure admitted from the inlet side, to open the valve disc,'andprovided with a rod 38, movable in "the guide '36, and bearing looselyon the stem 30, of the valve disc.

The valve body is sometimes distorted, or warped by the severe strainsto which it is subjected, to such an extent as "to locate the axis ofthe cylinder out of exact alinement with the axis of the valve disc.Such distortion is prevented, by the loose contact'of the rod 38 withthe stem 30, from interfering with the free movements of the piston andthe valve, said rod and stem being free to slip laterally on each other,

and thus compensate for any slight misin combination, a valve bodyhaving an angular, internal bridge provided with a carcular opening, thebody being provided with a larger clrcular opening coaxial, with andSpaced from the bridge opening: a

cap detachably secured to'the bodv and forming an imperforate closurefor the body opening; a cage including an outer ring'seated on the capand having-a sliding fit in the body opening. and an 'inner ring*provided with a shoulder seated on the bridge, a valve'disc seat, anex'ternalannular'*face having a sliding'fit in the bridge ppening,and an'internal"annular "guiding face forming a valve disc guide, said ringsbeing connected and spaced apart by rigid bars; a valve disc formed toclose on said seat, and having a winged stem slidable in said guidingface; and a closing spring 'interposed between the cap and the valvedisc, the cap constituting a spring"al utment and a clamp, releasablyconfining the cage shoulder against the bridge, the cage being guided toand from its operative position by the walls of the body and bridgeopenings.

' 2. A pressurereducing valve comprising, in combination, a valve bodyhaving an angular internal bridge provided witha circular opening, acage detachably secured to the valve body at the inlet side of thebridge, and provided with a valve disc seat, and with a valve disc guidewithin the bridge opening, a spring-pressed valve disc formed to closeon said seat, and provided with a stem projecting from the outlet sideof the bridge, the seat and valve disc being arran ed to normallyprevent the passageof fluid from the inlet 'tothe outlet side of thebridge, adiustablemeans at the outlet side for causing a predeterminedopening of the valve disc bv fluid pressure at the inlet side, saidmeans including a fixed cv'linder within the valve body having a peton-rod guide, anda piston movable in the cylinder by fluid pressure,and provided with a rod which projects from the cylinder through saidguide and contacts loosely with the valve disc stem, the contacting endsof the said piston-rod and stem being adapted to slip laterally on eachother and compensate for distortion of the valve body and misa'linementof-the rod and stem.

3. A pressure-reducing valve comprisin in combination, a valve bodyhaving an angular internal bridge provided with a "cir cular opening. acage detachably secured to the valve body at the inlet side of thebridge. and provided with a valveediscseat. and with a valve disc 'guide:within bridge opening, a spring' pressed valve disc formed to close onsaid seat, the seat and valve disc being arranged to normally preventthe passage of fluid from the inlet to nular inwardly projectingriserspaced from the seat.

In testimony whereof I have aflixed :ni

signature.

EDWARD 'WFFBB,

the outlet side of the bridge. and ad nstface. the ca e being providedwith an an-

